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beep − ring the bell
**beep **?*percent*?
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**The beep **command rings the keyboard bell. *Percent *is
relative to the base volume of the keyboard bell and can
range from ‐100 to 100 inclusive.
If *percent *is nonnegative then the bell volume is:
base ‐ [(base * *percent*) / 100] + *percent*
If *percent *is negative then the bell volume is:
base + [(base * *percent*) / 100]
The default *percent *is 50.
beep
bell, beep